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RNDCONTROL(8) DragonFly System Manager's Manual RNDCONTROL(8)

NAME

rndcontrol -- a utility for manipulating the /dev/random device

SYNOPSIS

rndcontrol [-q] [-sirq_no] [-cirq_no]

DESCRIPTION

The rndcontrol command is used to set which interrupts are used to help
add entropy to the CSPRNG maintained by the kernel. The /dev/random and
/dev/urandom devices are the user interface to this source of randomness.
Any changes take effect immediately.
The following command line options are supported:
-q Turn off all output except errors.
-sn Allow IRQ n to be used as a source of randomness. This option
may be repeated for more than one IRQ.
-cn Stop IRQ n from being used as a source of randomness. This
option may be repeated for more than one IRQ.
By default, all IRQs will help develop entropy. The kernel uses a rate-
limited helper thread to add the actual entropy and even fast interrupts
should not detrimentally affect a running system.